Speculum.



T. H. HUM'PHREYS.

sPBoUL-UM. APP-LIATION ILED Arms. 1910.

Patented July 11, 1911..

THOMAS H. HUIVIPHREYS, OF KISSEE MILLS, MISSOURI.

SPECULUM.

speeiaeation of Letters Patent. Parent@ July i1, 1911.

pplieation filed April 8, 1910. Serial No. 554,274. v

To all whom it may concern.'

Be it known that I, THOMAS I-I. HUM- PnRnYs, a citizen of the United States, residing at Kissee Mills, in the county of Taney and State of Missouri, have invented new and useful Improvements in Specula, of which the following is a speciiication;

rThis inventionrelates'to specula of the bivalve type, the object of the invention being to provide a simple'and eective device of this character which,while readily capable of adjustment to expand theorice to the desired degree, is free from nuts, bolts, screws and other complexities of parts and surfaces in which disease germs may lodge, and which is. adapted to be conveniently taken apart for thorough sterilization. The invention consists of the features of construction, combination and arrangement of parts herein fully described and claimed, reference being had to the accompanying drawing, in which:-

Figure 1 is a front elevation of a speculum embodying my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a sectional view takenon theline 33 of Fig. 1, Fig. tis a sectional view on the line 1f-A of Fig. 1.

The device comprises a pair of' members 1 and 2 provided, respectively, with coperating blades 3 and 4, which may be of any of the forms in common use, or any other suitable form.

The member 1 is provided with a handle or shank comprising parallel side bars 5 se-` 2 is also provided with a handle or shank composed of parallel side bars 1() secured at their inner ends to the blade 4 andconnected at their outer ends by a cross bar 11. The blade 4 is of reduced width with respect to the blade 3 and is adapted to enter and moven in the space between the side bars 5 of'the member 1, the side bars 10 thereof being provided with laterally extending guide pins or projections 12 to travel in the grooves or slots '7 'and thus admit of the adjustment-'ofthe member 2 upon the member 1 to space the blade 4' a greater or less distance from the blade 3, as occasion may require in the use of the instrument.

For the purpose of locking the member 2 in adjusted position upon the member 1, the bars lOfire provided upon theirfront faces with downwardly and inwardly inclined rack teeth or notches 13 adapted to engage and interlock with the rib' or edge 9 of the bar 6. It will be observed that the bars 10 extend through the spaces between the bars 5 at an upward and rearward inclination, so that the pressure applied upon the blade 4 in the use of the instrument will serve to holdfthe parts in locking engagement and prevent possible slipping` of thefmember 2 upon the member 1. After the device has been used, the arms-10 may be tilted outward from engagement with the locking edge 9 and the member 2 slid downward on the arms 5 until the pins or projections 12 pass int-o the entrance openings 8, whereupon said member may be detached from the memberl. i

It will be observed that by the construction described, a simple form of instrument is provided, which is free from the use of a number' of parts in whichdisease germs are liable to lodge, and 1n which the members may be rerdily disassembled after use and th orou ghly sterilized.

' Having thus described the invention, I claim:

A speculum comprising a member embodying a blade, a shank composed of spaced parallel side bars having longitudinal guide slots and open guideways at their inner ends leading to said slots, and a cross bar connecting the outer ends of .said side bars and beveled to provide a transverse locking rib, and a second member embodying a blade, a shank composed of spaced parallel side bars adaptedlto* iit between the side bars of theA first-named member, pins projecting laterally from said side bars'to said second mem- In testimony whereof I afHX my signature berdanclidably anl pvotallyhengaging th in presence of two Witnesses. gui e s ots'i'n t e si e bars of t e first-name w member, and rack teeth upon the side bars THOMAS H'HUMPHRLYS7 of the second-named member to engage and\ WVtnesses:

interlock with the locking rib of the rst- OTTO R. WOLF,

named member. S. C. KISSEE. 

